How do I pass a parameter to a portlet on the URL?

I have a portlet on one tab that searches for parts. (This portlet is written and maintained by someone else.) When a user clicks on a part number in the result set on this portlet they need to be taken to another tab (different portlet on the same page) with that part number as a parameter. The second portlet then dynamically writes an
<iframe src="http://someurl?partnumber=xyz" />
to call an external application passing the part number as a URL parameter to the external application.
Writing the <iframe /> dynamically is no problem. The problem is passing the part number from one portlet to another. We planned to do this by using hrefs in the part search portal using URLs like
http://hostname:port/pls/portal/url/page/test1/portlet2?partnumber=xyz
for each part number. The problem is that the URL parameter doesn't get passed to the second portlet. Here is the code in the second portlet:
<%
PortletRenderRequest portletRenderRequest =
(PortletRenderRequest)request.getAttribute("oracle.portal.PortletRenderRequest");
String partnumber = portletRenderRequest.getQualifiedParameter("partnumber");
%>
It always sees null for the partnumber parameter.
I also have <passAllUrlParams>true</passAllUrlParams> in provider.xml.
I've tried checking this by calling the URL of the second portlet directly from a browser. The portlet sees the partnumber parameter as null, but the URL window in the browser returns the modified URL from the portal with the partnumber parameter set properly. Portal is seeing the parameter but not passing it to the portlet.
I haven't tried actually setting the in the first portlet and seeing if it all works when called from inside the portal, but I don't see why it shouldn't work by calling the second portlet URL directly with a parameter.
Am I missing some step in order to pass a parameter from one portlet to another? The parameters I have to pass are dynamic, based on the result set returned by a search in the first portlet.

My second to last paragraph should have been:
"I haven't tried actually setting the hrefs in the first portlet and seeing if it all works when called from inside the portal, but I don't see why it shouldn't work by calling the second portlet URL directly with a parameter."

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Message was edited by:
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